public class Example2_2 {
    public static void main (String args[]) {
        byte b = 22;
        int n = 129;
        float f = 123456.6789f;
        double d=123456789.123456789;
        System.out.println("b =   "+b);
        System.out.println("n =   "+n);
        System.out.println("f =   "+f);
        System.out.println("d =   "+d);
        b = (byte)n;       //导致精度的损失
        f = (float)d;      //导致精度的损失
        System.out.println("b =   "+b);
        System.out.println("f =   "+f);
    }
}
